A few things you can try...
You can try these fixes...
Try uninstalling your Java from the add/remove programs and then re-install the JRE 5.11 offline version....
Archive: Download Java 2 Platform Standard Edition (J2SE) 5.0 Update 11
Try deleting your preference folder/s...
Fixes for Limewire when LW isn't operating as it should
Finding your preference folder in Vista...
http://www.gnutellaforums.com/genera...der-vista.html
If that does not work, let me know your router make and model number, so you can open a port for limewire to pass through.. Most Linskys have Nat Firewalls...